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STOCKHOLDERS' EQUITY (Tables) | 12 Months Ended
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Dec. 31, 2013
STOCKHOLDERS' EQUITY |
Schedule of warrants outstanding to purchase common stock and classified as equity | As of December 31, 2013, the following warrants to purchase our common stock were outstanding and classified as equity:
Issuance Date |  | Exercise Price |  | Number of Shares |  | Exercisable Date |  | Expiration Date
--- | --- | --- | --- | --- | --- | --- | --- | ---
November 2011(1) |  | $ | 2.32 |  |  | 461,382 |  | November 2011 |  | November 2021
August 2011(1) |  | $ | 3.98 |  |  | 537,893 |  | August 2011 |  | August 2021
September 2009 |  | $ | 9.00 |  |  | 150,000 |  | September 2009 |  | September 2014
April 2005 |  | $ | 3.75 |  |  | 470,000 |  | April 2005 |  | April 2015
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
|  |  |  |  |  | 1,619,275 |  |  |  |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
(1) In connection with each disbursement under the loan agreement with CIRM, we were obligated to issue to CIRM a warrant to purchase Geron common stock. Each of the warrants and the underlying common stock were unregistered. We have no further obligations to issue any additional warrants to CIRM.
Schedule of aggregate option and award activity | Aggregate option and award activity for the 2002 Plan, 2011 Plan, 1996 Directors Plan and 2006 Directors Plan is as follows:
|  |  |  | Outstanding Options |
--- | --- | --- | --- | --- | ---
|  | Shares Available For Grant |  | Number of Shares |  | Weighted Average Exercise Price Per Share |  | Weighted Average Remaining Contractual Life (In years) |  | Aggregate Intrinsic Value (In thousands) |
Balance at December 31, 2012 |  |  | 13,557,771 |  |  | 17,811,506 |  | $ | 4.05 |  |  |  |  | $ | 2 |
Options granted |  |  | (6,366,000 | ) |  | 6,366,000 |  | $ | 1.57 |  |  |  |  |  |  |
Awards granted |  |  | (66,853 | ) |  | — |  | $ | — |  |  |  |  |  |  |
Options exercised |  |  | — |  |  | (1,960,245 | ) | $ | 3.35 |  |  |  |  |  |  |
Options canceled/forfeited |  |  | 6,641,045 |  |  | (6,641,045 | ) | $ | 4.25 |  |  |  |  |  |  |
Awards canceled/forfeited |  |  | 2,441,287 |  |  | — |  | $ | — |  |  |  |  |  |  |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Balance at December 31, 2013 |  |  | 16,207,250 |  |  | 15,576,216 |  | $ | 3.04 |  |  | 6.83 |  | $ | 33,798 |
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Options exercisable at December 31, 2013 |  |  |  |  |  | 8,144,040 |  | $ | 4.26 |  |  | 5.05 |  | $ | 11,194 |
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​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Options fully vested and expected to vest at December 31, 2013 |  |  |  |  |  | 15,122,068 |  | $ | 3.08 |  |  | 6.77 |  | $ | 32,402 |
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Schedule of information about stock options outstanding by exercise price range | Information about stock options outstanding as of December 31, 2013 is as follows:
|  | Options Outstanding |
--- | --- | --- | ---
Exercise Price Range |  | Number of Shares |  | Weighted Average Exercise Price Per Share |  | Weighted Average Remaining Contractual Life (In years) |
$1.10 - $1.50 |  |  | 4,627,834 |  | $ | 1.42 |  |  | 8.57 |
$1.51 - $1.70 |  |  | 4,217,041 |  | $ | 1.54 |  |  | 9.04 |
$1.71 - $6.39 |  |  | 4,067,162 |  | $ | 3.78 |  |  | 6.16 |
$6.40 - $9.32 |  |  | 2,664,179 |  | $ | 7.08 |  |  | 1.35 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
$1.10 - $9.32 |  |  | 15,576,216 |  | $ | 3.04 |  |  | 6.83 |
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Schedule of aggregate restricted stock activity | Aggregate restricted stock activity for the 2002 Plan, 2011 Plan and 2006 Directors Plan is as follows:
|  | Number of Shares |  | Weighted Average Grant Date Fair Value Per Share |  | Weighted Average Remaining Contractual Term (In years) |
--- | --- | --- | --- | --- | --- | --- | ---
Non-vested restricted stock at December 31, 2012 |  |  | 2,917,962 |  | $ | 4.08 |  |  | 0.90 |
Granted |  |  | 66,853 |  | $ | 2.41 |  |  |  |
Vested |  |  | (134,091 | ) | $ | 3.77 |  |  |  |
Canceled/forfeited |  |  | (2,441,287 | ) | $ | 3.92 |  |  |  |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Non-vested restricted stock at December 31, 2013(1) |  |  | 409,437 |  | $ | 4.84 |  |  | 0.82 |
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(1) Includes 139,000 performance-based restricted stock awards that have not achieved certain strategic goals.
Summary of allocation of stock-based compensation expense related to share-based payment awards | The following table summarizes the stock-based compensation expense related to stock options, restricted stock awards and employee stock purchases for the years ended December 31, 2013, 2012 and 2011 which was allocated as follows:
|  | Year Ended December 31, |
--- | --- | --- | ---
|  | 2013 |  | 2012 |  | 2011 |
|  | (In thousands) |
Research and development |  | $ | 1,741 |  | $ | 2,336 |  | $ | 5,799 |
Restructuring charges |  |  | 28 |  |  | 107 |  |  | 174 |
General and administrative |  |  | 2,666 |  |  | 2,868 |  |  | 9,276 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Stock-based compensation expense included in operating expenses |  | $ | 4,435 |  | $ | 5,311 |  | $ | 15,249 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Schedule of assumptions used to estimate the fair value of stock options granted | The fair value of stock options granted in 2013, 2012 and 2011 has been estimated at the date of grant using the Black Scholes option-pricing model with the following assumptions:
|  | 2013 |  | 2012 |  | 2011
--- | --- | --- | --- | --- | --- | ---
Dividend yield |  | 0% |  | 0% |  | 0%
Expected volatility range |  | 0.742 to 0.792 |  | 0.631 to 0.740 |  | 0.629 to 0.660
Risk-free interest rate range |  | 0.80% to 1.97% |  | 0.81% to 1.25% |  | 0.88% to 2.37%
Expected term |  | 6 yrs |  | 6 yrs |  | 5 yrs
Schedule of assumptions used to estimate the fair value of employee stock purchases under the Purchase Plan | The fair value of employee stock purchases in 2013, 2012 and 2011 under the Purchase Plan has been estimated using the Black Scholes option-pricing model with the following assumptions:
|  | 2013 |  | 2012 |  | 2011
--- | --- | --- | --- | --- | --- | ---
Dividend yield |  | 0% |  | 0% |  | 0%
Expected volatility range |  | 0.506 to 1.391 |  | 0.458 to 0.774 |  | 0.278 to 0.584
Risk-free interest rate range |  | 0.09% to 0.21% |  | 0.06% to 0.21% |  | 0.10% to 0.32%
Expected term range |  | 6 mos to 12 mos |  | 6 mos to 12 mos |  | 6 mos to 12 mos
Schedule of common stock reserved for future issuance | Common stock reserved for future issuance as of December 31, 2013 is as follows:
Outstanding stock options |  |  | 15,576,216 |
Options and awards available for grant |  |  | 16,207,250 |
Employee stock purchase plan |  |  | 263,404 |
Warrants outstanding |  |  | 1,619,275 |
​ | ​ | ​ | ​ | ​
Total |  |  | 33,666,145 |
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- Definition Tabular disclosure of the allocation of equity-based compensation costs to a given line item on the balance sheet and income statement for the period. This may include the reporting line for the costs and the amount capitalized and expensed. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of share-based compensation plans that may be presented in a single table for outstanding, vested and expected to vest, and exercisable awards. The information that may be disclosed in this table may include, but is not limited to, number of shares, weighted average exercise price, weighted average remaining contractual life, and aggregate intrinsic value. + References No definition available. + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of employee stock purchase plans, including, but not limited to: (a) expected term, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of warrants or rights issued. Warrants and rights outstanding are derivative securities that give the holder the right to purchase securities (usually equity) from the issuer at a specific price within a certain time frame. Warrants are often included in a new debt issue to entice investors by a higher return potential. The main difference between warrants and call options is that warrants are issued and guaranteed by the company, whereas options are exchange instruments and are not issued by the company. Also, the lifetime of a warrant is often measured in years, while the lifetime of a typical option is measured in months. Disclose the title of issue of securities called for by warrants and rights outstanding, the aggregate amount of securities called for by warrants and rights outstanding, the date from which the warrants or rights are exercisable, and the price at which the warrant or right is exercisable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph i -Article 4 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6406099&loc=d3e25284-112666 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6784392&loc=d3e188667-122775 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 28 -Article 5 + Details
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